File Explorer

1;(function (root, factory, undef) {2	if (typeof exports === "object") {3		// CommonJS4		module.exports = exports = factory(require("./core"), require("./sha1"), require("./hmac"));5	}6	else if (typeof define === "function" && define.amd) {7		// AMD8		define(["./core", "./sha1", "./hmac"], factory);9	}10	else {11		// Global (browser)12		factory(root.CryptoJS);13	}14}(this, function (CryptoJS) {15 16	(function () {17	    // Shortcuts18	    var C = CryptoJS;19	    var C_lib = C.lib;20	    var Base = C_lib.Base;21	    var WordArray = C_lib.WordArray;22	    var C_algo = C.algo;23	    var MD5 = C_algo.MD5;24 25	    /**26	     * This key derivation function is meant to conform with EVP_BytesToKey.27	     * www.openssl.org/docs/crypto/EVP_BytesToKey.html28	     */29	    var EvpKDF = C_algo.EvpKDF = Base.extend({30	        /**31	         * Configuration options.32	         *33	         * @property {number} keySize The key size in words to generate. Default: 4 (128 bits)34	         * @property {Hasher} hasher The hash algorithm to use. Default: MD535	         * @property {number} iterations The number of iterations to perform. Default: 136	         */37	        cfg: Base.extend({38	            keySize: 128/32,39	            hasher: MD5,40	            iterations: 141	        }),42 43	        /**44	         * Initializes a newly created key derivation function.45	         *46	         * @param {Object} cfg (Optional) The configuration options to use for the derivation.47	         *48	         * @example49	         *50	         *     var kdf = CryptoJS.algo.EvpKDF.create();51	         *     var kdf = CryptoJS.algo.EvpKDF.create({ keySize: 8 });52	         *     var kdf = CryptoJS.algo.EvpKDF.create({ keySize: 8, iterations: 1000 });53	         */54	        init: function (cfg) {55	            this.cfg = this.cfg.extend(cfg);56	        },57 58	        /**59	         * Derives a key from a password.60	         *61	         * @param {WordArray|string} password The password.62	         * @param {WordArray|string} salt A salt.63	         *64	         * @return {WordArray} The derived key.65	         *66	         * @example67	         *68	         *     var key = kdf.compute(password, salt);69	         */70	        compute: function (password, salt) {71	            var block;72 73	            // Shortcut74	            var cfg = this.cfg;75 76	            // Init hasher77	            var hasher = cfg.hasher.create();78 79	            // Initial values80	            var derivedKey = WordArray.create();81 82	            // Shortcuts83	            var derivedKeyWords = derivedKey.words;84	            var keySize = cfg.keySize;85	            var iterations = cfg.iterations;86 87	            // Generate key88	            while (derivedKeyWords.length < keySize) {89	                if (block) {90	                    hasher.update(block);91	                }92	                block = hasher.update(password).finalize(salt);93	                hasher.reset();94 95	                // Iterations96	                for (var i = 1; i < iterations; i++) {97	                    block = hasher.finalize(block);98	                    hasher.reset();99	                }100 101	                derivedKey.concat(block);102	            }103	            derivedKey.sigBytes = keySize * 4;104 105	            return derivedKey;106	        }107	    });108 109	    /**110	     * Derives a key from a password.111	     *112	     * @param {WordArray|string} password The password.113	     * @param {WordArray|string} salt A salt.114	     * @param {Object} cfg (Optional) The configuration options to use for this computation.115	     *116	     * @return {WordArray} The derived key.117	     *118	     * @static119	     *120	     * @example121	     *122	     *     var key = CryptoJS.EvpKDF(password, salt);123	     *     var key = CryptoJS.EvpKDF(password, salt, { keySize: 8 });124	     *     var key = CryptoJS.EvpKDF(password, salt, { keySize: 8, iterations: 1000 });125	     */126	    C.EvpKDF = function (password, salt, cfg) {127	        return EvpKDF.create(cfg).compute(password, salt);128	    };129	}());130 131 132	return CryptoJS.EvpKDF;133 134}));